Security Labs SLM462 4-Channel 500GB System with 18.5" Monitor: * 4 channels * 500GB hard drive, expandable up to 2TB * 18.5" widescreen LED monitor * Includes four 600 TVL cameras with mechanical IR cut filters * 3G/4G smartphone monitoring, email and SMS text messaging with an image, plus free mobile apps * 130-point grid video motion detection per channel